Yes, we have been contemplating this before but didn't get to it in the time frame of BV 2.0 (which just was finalized). I'd suggest you open an issue in the reference implementation (HV JIRA project) for exploring this feature there? The way we could do it for the time being would be a separate annotation, to be given next to one of the temporal constraints such as @Future.

A downside is that such separate annotation would apply to all the temporal constraints hosted by the annotated member, but I think that's acceptable as there hardly will be more than one (or if so, they should be fine with the same skew value).